Nanomix Announces carbon nanotube Based Hydrogen Sensor

Nanomix recently announced its first commercial product -- a hydrogen gas sensor.  The transduction scheme is based on carbon nanotubes.   It would be interesting to see how their sensor compares with traditional schemes such as chemi-resistors and ChemFETs.  Nanomix claims that carbon nanotubes are extremely sensitive; that may be, but what about issues such as poisoning and cross-sensitivities from gases such as CO?  Nanomix also claims that their sensor can detect very low concentrations of H2.  While this is certaibly a nice feature, the immunity to poisoning agents may actually be more important because H2 does not become explosive at concentrations below 4%.